body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f5f5f5;
  color: #1f2937;
}

.container {
  max-width: 800px;
  margin: auto;
  padding: 1rem;
}

h1 {
  text-align: center;
  color: #2196f3;
}

.subtitle {
  text-align: center;
  color: #6b7280;
  margin-bottom: 1rem;
}

.card {
  background: white;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,.08);
}

.upload {
  border: 2px dashed #2196f3;
  text-align: center;
  cursor: pointer;
}

.upload input {
  display: none;
}

.primary {
  width: 100%;
  padding: .8rem;
  background: #2196f3;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}

.primary:hover {
  background: #1976d2;
}

.file-item {
  display: flex;
  justify-content: space-between;
  padding: .5rem 0;
  border-bottom: 1px solid #e5e7eb;
}

.progress {
  height: 8px;
  background: #e5e7eb;
  border-radius: 8px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: #2196f3;
  transition: width .3s;
}

iframe {
  width: 100%;
  height: 400px;
  border-radius: 8px;
  border: none;
}

.hidden {
  display: none;
}

@media (max-width: 600px) {
  iframe {
    height: 300px;
  }
}